Finally managed to get battleline squads II, III and the lieutenant finished over the christmas period, had to wait on some matte varnish to arrive before I could call them finished. Haven't been completely unproductive though, managed to make a start on five more marines for each squad, to round out both to ten. Should hopefully have these done soon. In hindsight I wish I had given the squad leaders melee weapons, as I'm building this army with the intention of playing tabletop for the first time since the early 2000's. However you live and you learn, I guess it's a few points I can spend elsewhere!
Trying my hand at some minor lore for the squads below...

Battleline Squad III. Designation: Torres. Led by the newly promoted Sergeant Ceval Torres, after the death of the squads previous commander to the vile forces of Chaos during the short-lived campaign on Endimion VI. The newly acquired burden of command lies heavily on the comparatively young marines shoulders. However, he is eager to prove his worth to company and chapter, noted for leading the remnants of his squad in multiple daring frontal assaults during the campaign where they lost their previous sergeant, auto-bolt rifles spitting out unrelenting fury upon the forces of the Arch-Enemy.

Battleline Squad II. Designation: Savales. Squad Savales is commanded by the ever-dependable Juno Savales, a true scion of Dorn. Consitantly able to hold the line against the most furious of assaults by enemy forces, whilst keeping up a withering pace of fire and giving cover to the companies advancing battle-brothers. Many a battle plan composed by Captain Isidore Haleous has been formed around the linchpin of Squad Savales holding a barricade or strongpoint and providing an anvil upon which to smash any opposition.

2nd Lieutenant Antorus Alvor was counted amongst the first shipment of Primaris recruits to the Chapter from Lord Commander Roboute Guilliman, fighting alongside his "Unnumbered Sons" for many years before being presented to Chapter Master Kantor upon the Indomitus Crusades arrival to Rynn's World.
A veteran commander, much loved by his fellow marines. Many a member of the 4th Company has quietly joked (although certainly never to his face) that there was some kind of Adminstratum error and he was destined for the Imperial Fists upon his release from Guilliman's Greyshields, his dour nature being much more fitting to their cousins in that most severe of Chapters. However, despite how quiet and taciturn he may be, Alvor remains an exemplary member of company command, being a brother Captain Haleous can depend upon in the most trying of engagements.

I was going to move onto a ten man squad of stalker equipped intercessors after the reinforcements for those squads, so I had a squad for every variant of bolt rifle, but I think I'll need a break from intercessors for a minute, so I've decided to semi-true-scale a five man sternguard squad out of the deathwatch kill-team and a box of sternguard veterans. As much as I like the scale of primaris, I still hold a special place in my heart for the older marines, and hopefully the Deathwatch legs won't look tiny compared to their taller brothers.
Also, I love the idea of a squad of veterans seconded to the various companies in order to aid and educate the newer generation of Astartes in the chapters culture and the proper arts of war, fitting to the sons of Dorn. Maybe each squad leader could be assigned to one of the veterans as a sort of tutor? I don't know, just playing with lore ideas at the moment. Hopefully it works out, might have to bust out some green stuff and shave off some of the Deathwatch symbols, we'll see.

Anyway, hope everyone here had a great Christmas and is looking forward to an even better new year. See you all in 2020! Cheers!